Dispersive waveguide propagation of ambient sound in the ocean- surface bubble layer
碩士 === 國立中央大學 === 物理學系 === 86 === Wave-breaking events create bubbly layers at the ocean surface. These layers act as a waveguide for sound propagation in the audio frequency range.Experiments show that acoustic propagation in such a wave...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
1998
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| Online Access: | http://ndltd.ncl.edu.tw/handle/69024778085248131069 |
| Summary: | 碩士 === 國立中央大學 === 物理學系 === 86 === Wave-breaking events create bubbly layers at the ocean
surface. These layers act as a waveguide for sound propagation
in the audio frequency range.Experiments show that acoustic
propagation in such a waveguide occurs in distinctfrequency
bands. We use the dispersive and exponential sound speed profile
to investigate the sound propagation. The theoretical results
are in good agreementwith the observations. It is found that the
frequency bands are due to normal modepropagation. The number of
normal modes is shown to correspond to the number of discrete
acoustic bands. The theoretical results are also compared to
thenondispersive-exponential profile and inverse-square profile
which have beenstudied in the past.
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